feat(twenty-sdk): extract & compile app translations into the manifest (#22236)

## Summary

**PR 2/4** of the app-metadata-translations stack. Gives app developers
the authoring side, as part of the normal manifest build — and it stays
out of the way of developers who don't translate.

- `twenty-sdk` CLI i18n pipeline: collect translatable strings from the
manifest, generate value-as-key message ids (`sha256(value)` truncated,
byte-identical to the server's `generateMessageId`), a `dev
i18n-extract` command to scaffold per-locale catalog files, and a
compile step folded into `build` that emits `manifest.translations`.
- Opt-in: no `locales/` dir → `compileApplicationTranslations` returns
`undefined` → manifest is unchanged.
- Adds an optional `locale` to the front-component execution context so
components can translate against the host locale.

## Stack
Stacks on #22235 (PR 1/4). Base branch:
`claude/app-translation-1-runtime-resolution`.

## Tests
Unit (vitest): extract/compile round-trip + message-id determinism.

## Verification note
`yarn install` could not complete in the remote dev environment, so
typecheck/lint/tests were not run locally — **CI is the source of
truth**.

https://claude.ai/code/session_01NiE7o3cd3zCLZarVkJa6UA

---
_Generated by [Claude
Code](https://claude.ai/code/session_01NiE7o3cd3zCLZarVkJa6UA)_

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packages/twenty-sdk/src/cli/commands/dev/index.ts

@@ -7,6 +7,7 @@ import { AppBuildCommand } from './build';
 import { AppDevCommand } from './dev';
 import { AppDevOnceCommand } from './dev-once';
 import { AppGenerateClientCommand } from './generate-client';
+import { AppI18nExtractCommand } from './i18n-extract';
 import { AppTypecheckCommand } from './typecheck';
 import { registerDevFunctionCommands } from './function';
 
@@ -17,6 +18,7 @@ export const registerDevCommands = (program: Command): void => {
   const typecheckCommand = new AppTypecheckCommand();
   const addCommand = new EntityAddCommand();
   const generateClientCommand = new AppGenerateClientCommand();
+  const i18nExtractCommand = new AppI18nExtractCommand();
 
   const devAction = async (
     appPath: string | undefined,
@@ -123,5 +125,19 @@ export const registerDevCommands = (program: Command): void => {
       });
     });
 
+  program
+    .command('dev:i18n-extract [appPath]')
+    .description('Extract translatable strings into locales/ catalogs')
+    .option(
+      '--locale <locale>',
+      'Scaffold an empty catalog for a target locale (e.g. fr-FR)',
+    )
+    .action(async (appPath, options) => {
+      await i18nExtractCommand.execute({
+        appPath: formatPath(appPath),
+        locale: options.locale,
+      });
+    });
+
   registerDevFunctionCommands(program);
 };